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A refrigerator is a kind of commercial and household appliance. It consists of an insulated compartment and a heat pump (mechanical, electronic, or chemical). The heat pump transfers heat from the inside to the outside environment to cool the inside to below room temperature. temperature. The refrigerator should be kept at 40° F (4° C) or below, and the freezer compartment should be adjusted at 0° F (-18° C). Refrigeration is an essential food storage technology worldwide. The lower temperature reduces the reproduction rate of bacteria, so the refrigerator reduces the spoilage rate. The temperature of the refrigerator is several degrees above the freezing point of water. The optimal temperature range for storage of perishable food is 3 to 5 °C (37 to 41 °F).  A similar device that keeps the temperature below the freezing point of water is called a freezer. Refrigerators have replaced refrigerators, which have become common household appliances for nearly a century and a half.


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